Abstract:Early in a mammalian female's development, one of her two X chromosomes is silenced, thereby achieving dosage equivalence with the single X chromosome found in males. The process of inactivation is initiated by the untranslated XIST RNA that is expressed solely from the inactive X. Subsequent silencing involves the acquisition of many features of heterochromatin, including late DNA replication, DNA hypermethylation, and specific histone modifications. How the XIST RNA associates in cis with the chromosome from… Show more
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